Recording Method
MII machines recorded six tracks: two by the moving heads and four by the stationary head. Starting from the top of the tape, the first two were stationary head audio channels two and one. Below these were the two moving head tracks called C and Y, which are frequency modulated parts of the video signal. The C track also contained audio channels three and four, frequency modulated. Going further down the tape, the last two stationary head tracks carried control and time code information, respectively. The control signal was used to synchronize the moving heads.
For the video, luminance was simply frequency modulated and written to the Y track. The two chrominance signals, Pr and Pb, were combined into one signal by chrominance time compressed multiplexing (CTCM), which is a type of time division multiplexing. The resulting CTCM signal was frequency modulated and combined with the FM audio carriers before it was written to the C track.
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